CN105323417A - Print data processing method - Google Patents
Print data processing method Download PDFInfo
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- CN105323417A CN105323417A CN201510626596.0A CN201510626596A CN105323417A CN 105323417 A CN105323417 A CN 105323417A CN 201510626596 A CN201510626596 A CN 201510626596A CN 105323417 A CN105323417 A CN 105323417A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/64—Systems for the transmission or the storage of the colour picture signal; Details therefor, e.g. coding or decoding means therefor
- H04N1/648—Transmitting or storing the primary (additive or subtractive) colour signals; Compression thereof
Abstract
The invention provides a print data processing method. The print data processing method comprises the following steps: converting an original document format of a page to be printed into a 24-bit BMP bitmap by an upper computer; newly constructing two 8-bit BMP bitmap cache regions, two 1-bit BMP bitmap cache region and two JBIG (Joint Bi Level Image Group) document cache regions by the upper computer; performing pixel judgment on the 24-bit BMP bitmap by the upper computer, and converting the 24-bit BMP bitmap into one red 8-bit BMP bitmap and one black 8-bit BMP bitmap; performing image optimization processing on the red 8-bit BMP bitmap and the black 8-bit BMP bitmap by the upper computer; performing image compression processing on a red 1-bit BMP bitmap and a black 1-bit BMP bitmap by the upper computer; and transmitting red JBIG documents and black JBIG documents to a lower computer by the upper computer, processing print data of the lower computer and finishing the red and black dual-color printing. The print data processing method provided by the invention has the advantages of being high in print data processing efficiency, low in cost of consumable and good in red and black staining degree.
Description
Technical field
The invention belongs to print data processing technology field, especially relate to a kind of print data processing method.
Background technology
Printer is the most frequently used office output equipment, for printing black and white text and colour picture.In the routine work of the special client such as government bodies at home, official document contact is frequent, and making official document needs to use color printer.
For color laser printer, a complete print data processing procedure is completed by four steps usually: first, carry out file format conversion, by original document, as doc, txt, html file transform becomes a width BMP bitmap file; Secondly, carry out iconic model conversion, BMP bitmap file (RGB model) is converted into color printer private file (CMYK model); Again, piece image is divided into four width images, represents the carbon dust ratio of green grass or young crops, product, Huang, black four kinds of colors respectively, by USB or Ethernet, four width images are issued to the toner cartridge of printer respective color from PC; Finally, start printing mechanism, according to the data of four width images, be also the carbon dust ratio of four kinds of colors, from four look toner cartridges, draw corresponding carbon dust amount, by file printout out.
In above-mentioned print data processing procedure, toner cartridge carbon dust only has green grass or young crops, product, Huang, black four kinds of colors, and other color needs to mix green grass or young crops, product, Huang by a certain percentage, black, four look carbon dusts could furnishing.And print red pixel point and need, same location of pixels duplicate printing four times, sequentially to fill four look carbon dusts in proportion.Along with the carbon dust approach exhaustion of wherein a kind of color, the redness printed also deviation gradually, cannot meet the making needs of official document.And the bulging powder consumption of other color is less, shelve problems such as there will be caking for a long time, cause the waste of consumptive material.In addition, above-mentioned print data processing procedure is very complicated, not only need format transformation and color model, also need piece image to be divided into four width images, data volume is large, and amount of calculation is large, takies more PC resource and larger printer memory space, cause the data handling procedure used time longer, print speed slower.
Summary of the invention
The invention provides a kind of print data processing method, can effectively improve print data treatment effeciency.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of print data processing method, comprising:
Native file format page to be printed is converted to euchroic pattern bitmap by S1, host computer;
Newly-built two the grayscale mode bitmap caching districts of S2, described host computer, two netrual colour pattern bitmap caching districts and two compressed encoding file cache districts;
S3, described host computer judge the pixel column column position of described euchroic pattern bitmap, be a red grayscale mode bitmap and a black gray pattern bitmap by described euchroic pattern bitmap-converted, transformation result write respectively two described grayscale mode bitmap caching districts;
Described red grayscale mode bitmap and described black gray pattern bitmap are carried out image optimization process by S4, described host computer, be converted to red netrual colour pattern bitmap and black netrual colour pattern bitmap respectively, transformation result write respectively two described netrual colour pattern bitmap caching districts;
Described red netrual colour pattern bitmap and described black netrual colour pattern bitmap are carried out image Compression by S5, described host computer, be converted to red compressed encoding file and black compressed encoding file respectively, transformation result write respectively two described compressed encoding file cache districts;
Described two compressed encoding files are sent to slave computer by S6, described host computer respectively, carry out the process of slave computer print data.
Further, described euchroic pattern bitmap is 24 BMP bitmaps, and described grayscale mode bitmap is 8 BMP bitmaps, and described netrual colour pattern bitmap is 1 BMP bitmap, and described compressed encoding file is jbig file.
Further, described slave computer print data treatment step comprises:
Described slave computer receives the described red jbig file of described host computer transmission and described black jbig file;
Described red jbig file and black jbig file are carried out image decoding process by described slave computer, are reduced into red 1 BMP bitmap and black 1 BMP bitmap respectively;
Described slave computer starts printing mechanism, prints described red 1 BMP bitmap and described black 1 BMP bitmap respectively.
The advantage that the present invention has and good effect are:
1, the present invention can effectively improve print data treatment effeciency.Official document only has red, black two kinds of colors, compared with prior art, print data processing method of the present invention is without the need to carrying out image format conversion, be CMYK model by RGB model conversion, then be divided into four color pixel dot matrix, but according to pixels RGB bitmap is directly divided into two by color, be divided into red pixel dot matrix and black picture element dot matrix, thus decrease print data handling process, reduce algorithm complex, and then improve printing speed.
2, the present invention can reduce consumables cost.Compared with prior art, print data processing method of the present invention, without the need to using four look carbon dusts to mix painted in proportion, but by red, black carbon powder is directly painted.Same pixel, without the need to repeatedly printing four times, only need print once, non-black and red, decreases material loss, reduces use cost.
3, red, the black degree of staining of the present invention is good.The present invention can modulate red carbon powder by national standard, solid colour no color differnece, there will not be four look toner cartridge carbon dust quantity not sufficients in prior art and causes the red problem that deviation occurs.
Accompanying drawing explanation
Fig. 1 is the first embodiment flow chart of print data processing method of the present invention;
Fig. 2 is the second embodiment flow chart of print data processing method of the present invention;
Fig. 3 is the 3rd embodiment flow chart of print data processing method of the present invention;
Fig. 4 is the 4th embodiment flow chart of print data processing method of the present invention.
Embodiment
The present invention aims to provide a kind of print data processing method, Iamge Segmentation is carried out by host computer, extract the RED sector in BMP bitmap file and black part respectively, thus generate a width red image and a width black image, and then red, black two width images are forwarded to slave computer from host computer, carry out slave computer print processing, complete red, black double-colored printing.
Host computer PC drives red, black two-color printing jointly to perform described red, black double-colored print data processing method, and the making completing official document prints.Perform single page with a host computer and a slave computer and print to example, by reference to the accompanying drawings specific embodiments of the invention are elaborated.
As shown in Figure 1, in the first embodiment of the present invention, described print data processing method at least comprises the steps:
Native file format page to be printed is converted to euchroic pattern bitmap by S1, host computer;
Newly-built two the grayscale mode bitmap caching districts of S2, described host computer, two netrual colour pattern bitmap caching districts and two compressed encoding file cache districts;
S3, described host computer judge the pixel column column position of described euchroic pattern bitmap, be a red grayscale mode bitmap and a black gray pattern bitmap by described euchroic pattern bitmap-converted, transformation result write respectively two described grayscale mode bitmap caching districts;
Described red grayscale mode bitmap and described black gray pattern bitmap are carried out image optimization process by S4, described host computer, be converted to red netrual colour pattern bitmap and black netrual colour pattern bitmap respectively, transformation result write respectively two described netrual colour pattern bitmap caching districts;
Described red netrual colour pattern bitmap and described black netrual colour pattern bitmap are carried out image Compression by S5, described host computer, be converted to red compressed encoding file and black compressed encoding file respectively, transformation result write respectively two described compressed encoding file cache districts;
Described two compressed encoding files are sent to slave computer by S6, described host computer respectively, carry out the process of slave computer print data.
On the basis of the first embodiment, the second embodiment of the present invention as shown in Figure 2, at least comprises the steps: print data processing method of the present invention
In step sl, format conversion processing is carried out.Host computer PC drives the printing interface calling application software and provide, for the Word document in WindowsXP operating system, call the WindowsXP platform printing interface that Word provides, the file format of conversion current page is 24 BMP bitmaps by doc format conversion.Then step S2 is performed.
In step s 2, host computer PC driving is deposited middle application within it and is set up two 8 BMP bitmap caching districts, for storing red 8 BMP bitmap files and black 8 BMP bitmap files respectively.Two 8 described BMP bitmap caching districts represent the red page and the black page respectively, and described two 8 BMP bitmap caching districts are initialized as 0 respectively, represent that the red page and the black page are respectively white point.Calculate by resolution 1200dpi, A4 breadth, each buffer area is about 150MB.
Two 1 BMP bitmap caching district is set up in application again, for storing red 1 BMP bitmap file and black 1 BMP bitmap file respectively.Two 1 described BMP bitmap caching district represents red dot matrix and black dot matrix respectively, and described two 1 BMP bitmap caching district is initialized as 0 respectively, represents that red dot matrix and black dot matrix are respectively white point.Calculate by resolution 1200dpi, A4 breadth, each buffer area is about 18MB.
Two jbig file buffer areas are set up in last application again, and for storing red jbig file and black jbig file respectively, two described jbig file buffer areas are initialized as 0 respectively, represent jbig file not yet padding data.Because JBIG data volume is less, each jbig file buffer area 10MB is enough to.Then step S3 is performed.
In step s3, pixel determination processing is carried out.Host computer PC drives and judges current 24 BMP bitmap pixels column locations, from first pixel of first trip, from left to right, from up to down moves pixel pointer, till footline terminal column pixel, reads each pixel in current 24 BMP bitmaps successively.Current 24 BMP bitmap-converted are a redness 8 BMP bitmaps and a black 8 BMP bitmaps by two 8 BMP bitmap caching districts described in result of determination being write.
In step s 4 which, image optimization process is carried out.Red, black two-color printing is two monochrome printers in essence, needs 1 BMP bitmap but not 8 BMP bitmaps.Therefore, on 8 BMP bitmap bases, first strengthen contrast adjust, re-use halftoning, redness 8 BMP bitmaps, black 8 BMP bitmaps are converted to red 1 BMP bitmap, black 1 BMP bitmap respectively, the method makes the transition between red and white, B&W color more natural, and level is clearly more demarcated.Then by described redness 1 BMP bitmap, black 1 BMP bitmap two 1 BMP bitmap caching district that write step S2 application is set up respectively, and two 8 BMP bitmap caching districts described in release.Then step S5 is performed.
In step s 5, image Compression is carried out.JBIG is applicable to the compression of 1 BMP bitmap very much, algorithm maturation is general, the JBIG interface that directly can call WindowsXP provides completes JBIG coding, described redness 1 BMP bitmap, black 1 BMP bitmap are converted to red jbig file, black jbig file respectively, and be written to respectively in step S2 in two the jbig file buffer areas applying for setting up, discharge two 1 described BMP bitmap caching district simultaneously.Then step S6 is performed.
In step s 6, data sending processing is carried out.WindowsXP supports spool spool, described red jbig file, black jbig file are sent into spool respectively, WindowsXP Automatically invoked host computer PC drives and provides channel interface, two jbig files are sent to slave computer, host computer PC drives the channel provided can be the wire message way such as USB, Ethernet or UART, also can be the wireless channels such as WiFi or Bluetooth.Then perform step S7, carry out the process of slave computer print data.
As shown in Figure 3, on the basis of the second embodiment, the third embodiment of the present invention, the step of carrying out pixel determination processing specifically comprises:
From described 24 BMP bitmaps, take out a pixel, with current pixel pointer for address, read RGB tri-colouring component of current pixel, each component takies 1 byte, and scope is 0 ~ 255.And calculate or acquisition pixel gray level value of tabling look-up by empirical equation, judge that current pixel is as redness, black or white;
If current pixel is judged to be redness, then record the column locations of current pixel pointed, the buffer area red grey decision-making write being stored red 8 BMP bitmaps is in the byte of pixel column column position, representing that this pixel is red point.
If current pixel is judged to be black, then record the column locations of current pixel pointed, the buffer area write of black grey scale value being stored black 8 BMP bitmaps is in the byte of pixel corresponding line column position, representing that this pixel is stain.
If current pixel is judged to be white, then keeps described two 8 BMP bitmap caching districts to should the byte of pixel column column position be 0, represent that this pixel is white point.
Repeat above-mentioned steps, until after completing the judgement of all pixels in these 24 BMP bitmaps, generates two complete 8 BMP bitmaps, i.e. redness 8 BMP bitmaps and black 8 BMP bitmaps.
As shown in Figure 4, on the basis of the 3rd embodiment, the fourth embodiment of the present invention, the concrete steps of carrying out the process of slave computer print data comprise:
Step S7, carries out data receiver process.Slave computer detects host computer in real time and whether initiates print out task, when detecting that host computer initiates print out task, receive the red jbig file that issues of host computer and black jbig file immediately, and the redness being stored in printer respectively receives buffer area and black receives in buffer area.Then step S8 is performed.
Step S8, carries out image decompression decoding process.Slave computer calls JBIG decoding interface, described red jbig file and black jbig file are carried out decompress(ion) respectively, be reduced into red 1 BMP bitmap and black 1 BMP bitmap, and in the red toner cartridge buffer area being stored in printer respectively and black toner cartridge buffer area, the redness simultaneously described in release receives buffer area and black receives buffer area.Then step S9 is performed.
Step S9, carries out file printout process.Slave computer starts printing mechanism, is sent in black toner cartridge by described black 1 BMP bitmap, and the bit 0 in described black 1 BMP bitmap represents and do not absorb black carbon powder, and bit 1 represents and absorbs black carbon powder.Be sent in red toner cartridge by described red 1 BMP bitmap, the bit 0 in described red 1 BMP bitmap represents and does not absorb red carbon powder simultaneously, and bit 1 represents and absorbs red carbon powder.
When slave computer carries out pickup printing, first print black through described black toner cartridge, then print red through described red toner cartridge, red carbon powder is covered on black carbon powder, thus completes red, black double-colored printing.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (10)
1. a print data processing method, is characterized in that, described method at least comprises:
Native file format page to be printed is converted to euchroic pattern bitmap by S1, host computer;
Newly-built two the grayscale mode bitmap caching districts of S2, described host computer, two netrual colour pattern bitmap caching districts and two compressed encoding file cache districts;
S3, described host computer judge the pixel column column position of described euchroic pattern bitmap, be a red grayscale mode bitmap and a black gray pattern bitmap by described euchroic pattern bitmap-converted, transformation result write respectively two described grayscale mode bitmap caching districts;
Described red grayscale mode bitmap and described black gray pattern bitmap are carried out image optimization process by S4, described host computer, be converted to red netrual colour pattern bitmap and black netrual colour pattern bitmap respectively, transformation result write respectively two described netrual colour pattern bitmap caching districts;
Described red netrual colour pattern bitmap and described black netrual colour pattern bitmap are carried out image Compression by S5, described host computer, be converted to red compressed encoding file and black compressed encoding file respectively, transformation result write respectively two described compressed encoding file cache districts;
Described two compressed encoding files are sent to slave computer by S6, described host computer respectively, carry out the process of slave computer print data.
2. print data processing method according to claim 1, it is characterized in that, described euchroic pattern bitmap is 24 BMP bitmaps, and described grayscale mode bitmap is 8 BMP bitmaps, described netrual colour pattern bitmap is 1 BMP bitmap, and described compressed encoding file is jbig file.
3. print data processing method according to claim 2, it is characterized in that, in step s 2, two 8 described BMP bitmap caching districts represent the red page and the black page respectively, described two 8 BMP bitmap caching districts are initialized as 0 respectively, represent that the red page and the black page are respectively white point.
4. print data processing method according to claim 2, it is characterized in that, in step s 2, two 1 described BMP bitmap caching district represents red dot matrix and black dot matrix respectively, described two 1 BMP bitmap caching district is initialized as 0 respectively, represents that red dot matrix and black dot matrix are respectively white point.
5. print data processing method according to claim 2, is characterized in that, in step s 2, two described jbig file buffer areas are initialized as 0 respectively, represents jbig file not yet padding data.
6. print data processing method according to claim 2, it is characterized in that, in step s3, when judging the pixel column column position of described 24 BMP bitmaps, from first pixel of first trip, from left to right, from up to down move pixel pointer, till footline terminal column pixel, read each pixel in described 24 BMP bitmaps successively;
The step reading each pixel in described 24 BMP bitmaps comprises:
With current pixel pointer for address, read RGB tri-colouring component of current pixel, each component takies 1 byte, and scope is 0 ~ 255;
Obtain pixel gray level value, judge that current pixel is as redness, black or white;
If current pixel is judged to be redness, then record the column locations of current pixel pointed, the buffer area red grey decision-making write being stored red 8 BMP bitmaps is in the byte of pixel column column position, representing that this pixel is red point;
If current pixel is judged to be black, then record the column locations of current pixel pointed, the buffer area write of black grey scale value being stored black 8 BMP bitmaps is in the byte of pixel corresponding line column position, representing that this pixel is stain;
If current pixel is judged to be white, then keeps described two 8 BMP bitmap caching districts to should the byte of pixel column column position, represent that this pixel is white point.
7. print data processing method according to claim 2, is characterized in that, described slave computer print data treatment step comprises:
Described slave computer receives the described red jbig file of described host computer transmission and described black jbig file;
Described red jbig file and black jbig file are carried out image decoding process by described slave computer, are reduced into red 1 BMP bitmap and black 1 BMP bitmap respectively;
Described slave computer starts printing mechanism, prints described red 1 BMP bitmap and described black 1 BMP bitmap respectively.
8. print data processing method according to claim 7, is characterized in that, newly-built two of described slave computer receives buffer areas, for the described red jbig file that receives in storing step S7 respectively and described black jbig file; Newly-built two the toner cartridge buffer areas of described slave computer, for described red 1 the BMP bitmap after image decoding process in difference storing step S8 and described black 1 BMP bitmap.
9. print data processing method according to claim 7, is characterized in that, the step printing described black 1 BMP bitmap and described red 1 BMP bitmap comprises respectively:
Be sent in black toner cartridge by described black 1 BMP bitmap, the bit 0 in described black 1 BMP bitmap represents and does not absorb black carbon powder, and bit 1 represents and absorbs black carbon powder;
Be sent in red toner cartridge by described red 1 BMP bitmap, the bit 0 in described red 1 BMP bitmap represents and does not absorb red carbon powder, and bit 1 represents and absorbs red carbon powder.
10. print data processing method according to claim 9, is characterized in that, when described slave computer prints, first prints black through described black toner cartridge, then prints red through described red toner cartridge, and red carbon powder is covered on black carbon powder.
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| CN112130780A (en) * | 2020-09-21 | 2020-12-25 | 北京辰光融信技术有限公司 | Two-color printing method, device, equipment and computer readable storage medium |
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